gasoline pump vs island dispenser

gasoline pump and island dispenser both are nouns.

Word	Noun	Adjective	Verb	Adverb
gasoline pump	Yes	No	No	No
island dispenser	Yes	No	No	No

As nouns, gasoline pump and island dispenser are synonyms defined as:

gasoline pump and island dispenser: a pump in a service station that draws gasoline from underground storage tanks

Other synonyms of gasoline pump include gas pump, petrol pump.

gasoline pump (noun)	island dispenser (noun)
a pump in a service station that draws gasoline from underground storage tanks	a pump in a service station that draws gasoline from underground storage tanks